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On the pressure and stress singularities induced by steady flows of a pair of nonmiscible,incompressible,viscous fluids contacting a wall with slip

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Acta Mechanica Sinica 2020年第3期36卷 686-691页

作者： g.B.Sinclair Department of Mechanical Engineering Louisiana State UniversityBaton RougeLA 70803USA

An earlier asymptotic analysis identified the flow-induced power and log singularities present when two nonmiscible,incompressible,viscous fluids contact a wall with no slip *** a parallel asymptotic analysis identifies such singularities in pressures and stresses when slip is *** the singularity exponents for the two types of contact conditions are similar,the angles of interface impingement that have either power or log singularities are usually quite distinct.

关键词： Incompressible viscous fluids Slip conditions Fluid-structure interactions Singular stresses

gTCS-Vagus Nerve Stimulator Automation Using Private IoT-Blockchain Smartcontract

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Computer Systems Science & Engineering 2023年第2期44卷 1325-1340页

作者： g.Karthikeyan g.Kousalya Coimbatore Institute of Technology CoimbatoreIndia

generalized Tonic Clonic Seizure(gTCS)is a form of epileptic seizure in which a patient loses control over their entire body,ultimately leading to loss of *** Vagus Nerve Stimulator(VNS)is a tool/method for treating epileptic episodes that sends counter-electrical stimulations to the Vagus Nerve in order to mitigate epileptic signals from the *** machine is a stand-alone device that depends on human *** proposed framework uses an IoT and Blockchain oversight mechanism to augment the device's *** system counteracts against false-activation by monitoring the patient's vitals through a smart watch and allows only legitimate *** nominal operating threshold is determined by preprocessing inferences that include an 18-year-old gTCS epileptic patient and a data set of 281 non-gTCS epileptic *** proposed system functions as a dual control lock where the IoT system and the manually activation system work in tandem to activate the *** on the values sensed by the IoT device,the deployed system is able to make deci-sions and regulate the use of the *** IoT-Blockchain framework is able to fully eradicate false activation by increasing accuracy and transparency,ensur-ing the device is used correctly and safely.

关键词： IoT gTCS vagus nerve stimulator blockchain smart contract

Critical interfaces in body armour systems

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Defence Technology（防务技术） 2021年第6期17卷 1887-1894页

作者： Ian g.Crouch Ulverston Armour Solutions UlverstonLA127BJCumbriaUK

The ballistic performance,and behaviour,of an armour system is governed by two major sets of variables,geometrical and *** these,the consistency of performance,especially against small arms ammunition,will depend upon the consistency of the properties of the constituent *** a body armour system for example,fibre diameter,areal density of woven fabric,and bulk density of ceramic are examples of critical parameters and monitoring such parameters will form the backbone of associated quality control *** is often overlooked,because it can fall into the User’s domain,are the interfaces that exist between the various products;the carrier,the Soft Armour Insert(SAI),and the one or two hard armour plates(HAP1 and HAP2).This is especially true if the various products are sourced from different suppliers.

关键词： Interfaces Body armour Body armor Ceramic armour UHMWPE Aramids Ballistic fibres Fabrics Interfacial materials Hard armour plates Soft vests

Trajectory predictions of new lift separation sabots

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Defence Technology（防务技术） 2021年第4期17卷 1361-1373页

作者： Sreelal Mohanan Rajesh g Department of Aerospace Engineering Indian Institute of Technology MadrasChennaiTamilnadu600036India

This paper presents a modified analytical model to evaluate the trajectories of various lift separation sabot *** aerodynamic forces acting on the sabot surfaces during a supersonic flight are modeled in the present analytical model by incorporating the pressures on the windward side of the sabot due to the detached/attached shock and its reflections and then integrated using the 3-DoF dynamical *** trajectory and the aerodynamic coefficients were obtained for these configurations at a projectile Mach number of *** sabot configurations,which include two new designs,are compared with each other and with the conventional free flight trajectory data of the conventional *** mechanical interaction between the sabot and projectile is also addressed in the present *** comparison shows that the new designs with the aerodynamic surfaces close to the center of gravity,lift-off from the projectile with minimal mechanical interaction compared to a conventional sabot.

关键词： Lift separation Sabot Trajectory Shock reflection

Bianchi type I in f(T) gravitational theories

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Chinese Physics B 2016年第5期25卷 58-64页

作者： M I Wanas g g L Nashed O A Ibrahim Astronomy Department Faculty of Science Cairo University Cairo Egypt Centre for Theoretical Physics The British University in Egypt El-Sherouk City Egypt Mathematics Department Faculty of Science Ain Shams University Cairo Egypt Egyptian Relativity group (ERg) Giza Egypt

A tetrad field that is homogeneous and anisotropic which contains two unknown functions A（t） and B（t） of cosmic time is applied to the field equations of f（T）, where T is the torsion scalar, T = T~μ_（νρ）S_μ^（νρ）. We calculate the equation of continuity and rewrite it as a product of two brackets, the first is a function of f（T） and the second is a function of the two unknowns A（t） and B（t）. We use two different relations between the two unknown functions A（t） and B（t） in the second bracket to solve it. Both of these relations give constant scalar torsion and solutions coincide with the de Sitter one. So,another assumption related to the contents of the matter fields is postulated. This assumption enables us to drive a solution with a non-constant value of the scalar torsion and a form of f（T） which represents ΛCDM.

关键词： f(T) gravitational theory Bianchi type I special solutions

Assessing fire severity in Turkey's forest ecosystems using spectral indices from satellite images

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Journal of Forestry Research 2023年第6期34卷 1747-1761页

作者： Coşkun Okan güney Ahmet Mert Serkan gülsoy Department of Forest Fires Aegean Forestry Research Institute35430 IzmirTurkey Department of Wildlife Ecology and Management Faculty of ForestryIsparta University of Applied Science32260 IspartaTurkey Department of Soil Science and Ecology Faculty of ForestryIsparta University of Applied Science32260 IspartaTurkey

Fire severity classifications determine fire damage and regeneration potential in post-fire areas for effective implementation of restoration *** fire damage varies according to vegetation and fire characteristics,regional assessment of fire severity is *** objectives of this study were:(1)to test the performance of different satellite imagery and spectral indices,and two field—measured severity indices,CBI(Composite Burn Index)and geoCBI(geometrically structured Composite Burn Index)to assess fire severity;(2)to calculate classification thresholds for spectral indices that performed best in the study areas;and(3)to generate fire severity maps that could be used to determine the ecological impact of forest *** large fires in Pinus brutia(Turkish pine)and Pinus nigra *** ***(Anatolian black pine)—dominated forests during 2020 and 2021 were selected as study *** results show that geoCBI provided more reliable estimates of field—measured fire severity than *** Sentinel-2 and Landsat-8/OLI images performed similarly well,MODIS performed *** severity classification thresholds were determined for Sentinel-2 based RdNBR,dNBR,dSAVI,dNDVI,and dNDMI and Landsat-8/OLI based dNBR,dNDVI,and *** several spectral indices,the highest accuracy for fire severity classification was found for Sentinel-2 based RdNBR(72.1%)and Landsat-8/OLI based dNBR(69.2%).The results can be used to assess and map fire severity in forest ecosystems similar to those in this study.

关键词： Remote sensing Forest fire Fire severity Spectral indices Composite burn index

Investigation on 3Dt wake flow structures of swimming bionic fish

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Acta Mechanica Sinica 2012年第5期28卷 1494-1508页

作者： g.-X.Shen g.-K.Tan g.-J.Lai Fluid Mechanics Institute Beihang University

A bionic experimental platform was designed for the purpose of investigating time accurate three-dimensional flow field, using digital particle image velocimetry （DSPIV）. The wake behind the flapping trail of a robotic fish model was studied at high spatial resolution. The study was performed in a water channel. A robot fish model was designed and built. The model was fixed onto a rigid support frame- work using a cable-supporting method, with twelve stretched wires. The entire tail of the model can perform prescribed motions in two degrees of freedom, mainly in carangiform mode, by driving its afterbody and lunate caudal fin respectively. The DSPIV system was set up to operate in a trans- lational manner, measuring velocity field in a series of parallel slices. Phase locked measurements were repeated for a number of runs, allowing reconstruction of phase average flow field. Vortex structures with phase history of the wake were obtained. The study reveals some new and complex three-dimensional flow structures in the wake of the fish, including ＂reverse hairpin vortex＂ and ＂reverse Karman S-H vortex rings＂, allowing insight into physics of this complex flow.

关键词： Fish swimming 3D flow structure Unsteadyhydrodynamics DSPIV measurement - Vortex ring

Absence of Myosin Phosphatase Target Subunit 1 Alters Smooth Muscle Subtype through Ca2+ Sensitization

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Absence of Myosin Phosphatase Target Subunit 1 Alters Smooth...

Suppression of Self-Discharge in Aqueous Supercapacitor Devices Incorporating Highly Polar Nanofiber Separators

“细胞活动生命活力”——中国细胞生物学学会全体会员代表大会暨第十二次学术大会

作者： kristine E.Kamm James T.Stull Department of Physiology University of Texas Southwestern Medical CenterDallasTexasUSA

Smooth muscles can be classified into phasic and tonic subtypes based on their different contractile properties,but the molecular determinants that defines phasic and tonic subtypes remains *** this report,we analyzed contractile properties of phasic intestinal smooth muscle in the mice with smooth muscle-specific ablation of myosin phosphatase target subunit 1(MYPT1).The mutant intestinal smooth muscle displayed a loss of peristaltic contractile activity,and during activation,it exhibited a robust initial contraction followed by a sustained steady state with slow rate of force activation and relaxation and

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Energy & Environmental Materials 2023年第3期6卷 74-86页

作者： Wesley g.Buxton Simon g.King Vlad Stolojan Advanced Technology Institute University of SurreyGuildford SurreyGU27XHUK

One of the major problems limiting the applications of electric double-layer(EDLC)supercapacitor devices is their inability to maintain their cell voltage over a significant ***-discharge is a spontaneous decay in charged energy,often resulting in fully depleted devices in a matter of ***,a new method for suppressing this self-discharge phenomenon is proposed by using directionally polarized piezoelectric electrospun nanofiber films as separator *** engineering of polyvinylidene fluoride(PVDF)nanofiber films containing a small concentration of sodium dodecyl sulfate(SDS)results in a high proportion of polarβphases,reaching 380.5%of the total *** polarity into the separator material provides a reverse-diode mechanism in the device,such that it drops from an initial voltage of 1.6 down to 1 V after 10 h,as opposed to 0.3 V with a nonpolarized,commercial separator ***,the energy retained for the polarized separator is 37%and 4%for the nonpolarized separator,making supercapacitors a more attractive solution for long-term energy storage.

关键词： piezoelectric polar nanofibers PVDF separators self-discharge supercapacitors